Sub_dissectors assertion failed

[Scott <theerickson () gmail com>]

Devs,

This post pertains to two (probably) interrelated things.

If I am writing a dissector for a protocol that rides on top of IP but then
allows any protocol to follow it, how do I register them all correctly with
my dissector?  I see that IP does this by enumerating protocol numbers in
ipproto.h and then having dissectors call:
dissector_add("ip.proto", IP_PROTO_.., .._handle);

but think it would be overkill to do exactly the same thing in my case.
-----------
Also, besides all the pre-defined protocols I also tried registering a
custom dissector with it and got this:

ERROR:packet.c:709:dissector_add: assertion failed: (sub_dissectors)

Help will be appreciated.
-Scott

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